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-rw-r--r--core/chain_util_test.go77
1 files changed, 77 insertions, 0 deletions
diff --git a/core/chain_util_test.go b/core/chain_util_test.go
new file mode 100644
index 000000000..4bbe81194
--- /dev/null
+++ b/core/chain_util_test.go
@@ -0,0 +1,77 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+ "encoding/json"
+ "math/big"
+ "os"
+ "testing"
+
+ "github.com/ethereum/go-ethereum/common"
+)
+
+type diffTest struct {
+ ParentTimestamp uint64
+ ParentDifficulty *big.Int
+ CurrentTimestamp uint64
+ CurrentBlocknumber *big.Int
+ CurrentDifficulty *big.Int
+}
+
+func (d *diffTest) UnmarshalJSON(b []byte) (err error) {
+ var ext struct {
+ ParentTimestamp string
+ ParentDifficulty string
+ CurrentTimestamp string
+ CurrentBlocknumber string
+ CurrentDifficulty string
+ }
+ if err := json.Unmarshal(b, &ext); err != nil {
+ return err
+ }
+
+ d.ParentTimestamp = common.String2Big(ext.ParentTimestamp).Uint64()
+ d.ParentDifficulty = common.String2Big(ext.ParentDifficulty)
+ d.CurrentTimestamp = common.String2Big(ext.CurrentTimestamp).Uint64()
+ d.CurrentBlocknumber = common.String2Big(ext.CurrentBlocknumber)
+ d.CurrentDifficulty = common.String2Big(ext.CurrentDifficulty)
+
+ return nil
+}
+
+func TestDifficulty(t *testing.T) {
+ file, err := os.Open("../tests/files/BasicTests/difficulty.json")
+ if err != nil {
+ t.Fatal(err)
+ }
+ defer file.Close()
+
+ tests := make(map[string]diffTest)
+ err = json.NewDecoder(file).Decode(&tests)
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ for name, test := range tests {
+ number := new(big.Int).Sub(test.CurrentBlocknumber, big.NewInt(1))
+ diff := CalcDifficulty(test.CurrentTimestamp, test.ParentTimestamp, number, test.ParentDifficulty)
+ if diff.Cmp(test.CurrentDifficulty) != 0 {
+ t.Error(name, "failed. Expected", test.CurrentDifficulty, "and calculated", diff)
+ }
+ }
+}